过滤器动态地处理传入的请求和传出的响应，并且无需修改应用程序代码就可以透明地添加或删除它们。
Filters process incoming requests and outgoing responses dynamically and can be transparently added and removed without modifying application code.
通道过滤器：过滤器是通道中执行某种类型操作的透明的截取消息的组件，例如记录日志、转换、上下文处理等等。
Channel filters: filters are components that transparently intercept messages in channels to perform some kind of operation, such as logging, transformation, context manipulation, and so on.
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